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11 changes: 3 additions & 8 deletions compiler/rustc_parse/src/parser/attr_wrapper.rs
Original file line number Diff line number Diff line change
Expand Up @@ -352,15 +352,10 @@ impl<'a> Parser<'a> {
let target = AttrsTarget { attrs: final_attrs.iter().cloned().collect(), tokens };
self.capture_state.replace_ranges.push((start_pos..end_pos, Some(target)));
self.capture_state.replace_ranges.extend(inner_attr_replace_ranges);
}

// Only clear our `replace_ranges` when we're finished capturing entirely.
if matches!(self.capture_state.capturing, Capturing::No) {
} else if matches!(self.capture_state.capturing, Capturing::No) {
// Only clear the ranges once we've finished capturing entirely.
self.capture_state.replace_ranges.clear();
// We don't clear `inner_attr_ranges`, as doing so repeatedly
// had a measurable performance impact. Most inner attributes that
// we insert will get removed - when we drop the parser, we'll free
// up the memory used by any attributes that we didn't remove from the map.
self.capture_state.inner_attr_ranges.clear();
}
Ok(ret)
}
Expand Down